Drilling machine



Feb. 14, 1928.

G. H. GILMAN DRILLING MACHINE Fd. 14, 192s.

G. H. GILMAN DRILLING MACHINE Filed Feb. 3, 1921 2 Sheets-Sheet 2 W iv/ Geo 219 fill Patented Feb. 14, 192s.

UNITEDY STATES PATENT .-oFFlcE.

-GEOBGB H. GILMAN, 0l' BELMONT, MASBACHIIUSETTS.

DRILLING HAGHINE.

Application tiled February 8, 1821. Serial No. 442,084.

My invention relates to drillin machines and articularly but not exclusive y to those for rilling rock and provided with fluid operated feeding mechanism. l My invention will be best understood from the accompanying drawings and following description of a specific embodiment of my invention submitted for illustrative purposes, whiley its scope will be more articularly pointed out in the appended c aims.

In the drawings Figure 1 shows 'in sto er;

' g. 2 is a longitudinal section of the machine according to Fig. 1 on an enlarged scale and with arts broken away;

Figs. 3, 4 unil 5 respectively are sections on the lines 3--3, 4-4 and 5-5-5 of Fig. 2;

Fig. 6 is an elevation of the valve controlling the feed cylinde1";'

Fig. 7 is a section representingthe valve carried by the tool actuator in ole blowing positlon; and

Figs. 8, 9, 10 and 11 represent the positions of the valve carried y the feed cylinder.

The herein submitted embodiment of my invention selected for illustrative purposes in general com rises a feed cylinder which carries in slida le relation thereto a hammer drill which is connected to the piston of the feed cylinder. l

Referring to th drawings, I have shown a drill steel 1, the polygonal shank 2 of which is carried in a similarly shaped shank receiving recess in the chuck 3 in order that elevation a breast -when the latter rotates` the steel will rotate with it. Rearwardly of the st eel is mounted a hammer 4 for impartin lmpact to the vsteel and carried adjacent t e rearward portion of the machine is a rotary engine indicated at 5 which actuates the steelby imparting rotative action to the chuck. The details of the mechanism for actuating the steel are not claimed in this application and will only be described with sutlicient particularity to convey an understanding of how they :are ap lied to the invention under consideration. n general, this mechanism is similar to that shown in Patent No. 1,605,- 715, granted to me November 2, 1926.

As illustrated the motive iluld supply for the hammer and rotary engine is conducted into the tool actuator throngh a passage 6, whence it finds its way through the passage 7 into the rear end of the animer cylinder to maintain therem a continuous pressure. Motive liuid from the assage 6 1s alternately admltted to the cy index'v chamber portions 8 and '9, and exhausted therefrom M through the passa 21 to cause the hammer to reciprocate. erein for' operating the rotary engine motive fluid from the rearward continuous pressure chamber is conducted thereto through an intake passage o5 indicated diagrammatically at 10 and exhausted therefrom to the atmosphere through a passage indicated diagrammatically at 11. i

The casing for the tool actuator shownl 7o by the drawings is huilt u of sections which are held in assembled re ation by the four through-bolt 12, the section 13 of the casmg providing a valve block for the valve 14. This valve herein is provided with 15 the operating handle 15 and is supplied with motive Huid, in a manner hereinafter to be described, throuvh a passage 16 in the block, whence 1t may rhe conducted throu h the valve passage 6 eading to the tool actuating instrumentalities or as illustrated by Fig. 7 to the passage 19 in communication with the chuck chamber through the exhaust passave 21 and communicating passage 20. In the Sfnormal operation of the machine as indicated by Fig. 1, the port 19 is connected to the atmosphere through an arcuate passage 22 formed in the valve and communieating passage 23 formed in the valve block. ou

If the valve 141s turned clockwise from the osition illustrated by Fig. 1 through an ang e corres ending to the width of the port' 16, motive uid supply for the drill bit actuating instrumenta ed, while if the valve is turned counterclockwise from the position illustrated in Fig. 1 to that illustrated by Fig. 7, communication between the hammer exhaust passage 21 and the atmosphere will be interrupted and both the exhaust passage and the passage 6 leding to the hammer and rotary engine will be supplied. Under the conditions illustrated by Fig. 7, the drill steel will be actuated by rotation but without impact and the air which passes into the chuck chamber will l find its way through the passage 24 of the drill steel and blow the hole.

In this connection it is to be noted that the usual rock drill provides for the admission of a small amount of air to the hollow d rill steel which mingles with the water supphed,

assages 17 and 18 to either t e im ities will be interrupt- 05 This air acts to keep the sludge away from the cutting end of the bit and in a measure to free the drill hole of sludge. When the drill hole is to he cleaned an almornuxl aniouut of air is admitted thereto, which serves to forcibly eject the sludge and thoroughly clean the hole. 'lhis last operation is known as hole blowing and as u result thereof the hole is said to be bl\vn. In the submit-ted embodiment the normal supply of air is admitted from the exhaust passage and connection when t-he hammer is in o eration and the water is supplied through t e usual water tube 60. As has just been described, the abnormal supply of air for blowing the hole is admitted when the valve 17 is in the position illustrated by Fig. 7.

As illustrated the feedin mechanism for moving the actuator and too with relation to the rock comprises a cylinder member which is relatively stationary with respect to the actuator and to means providing a feed piston and feed piston rod, that is to say, a part ittin the cylinder and extending therefrom andaving one or more working pressure faces in the cylinder acted upon y the motive fluid. As shown this part has a piston head 26 to which is attached a tubular rod 32 extending from the rear end of the cylinder. On the upperside ot' the cylinder are shown ways 27 andon the lower portion ways 28. Herein slidably carried on the wa s 27 is the cradle 29, the latter being provi ed with four rip-standing ears 30 and portions 31 which engage the ways. 'lhe projecting ends of the lower bolts 12 holding the sections of thetool actuator casing 1n assembled relation are received by perforations in the ears 30. In this manner when the bolts are tightened the cradle and` sections of the casing are held in assembled relation.

As illustrated the rearmost end of the tubular rod 32 is provided with a reduced diameter portion 33, which provides a shoulder 34. The piston head 26 is carried by the reduced diameter portion and is held in position against the shoulder by the flange 35-of the plug 36 which also serves to close the 1nterior of the tubular iston rod to the forward end of the cylin er.

The piston rod is operatively connected to the hammer drill, and herein for this purose the rod 32 is provided with a reverse 'gend to provide a portion the end of which is adjacent the valve block for the tool actuator, this end being provided with a taered ortion 37 which is received by a similarly siaped socket in the union nipple 38 carried b the valve block and held in position by t e union nut 39. The bent portion of the rod 32 affords a handle particularly useful irl-spotting the hole under which conditions the supply to' the rear end of the feed cylinder may be throttled to provide a light feed and blow and theapphcation of the tool to the rock controlled by the operator.

In the prerent embodiment of the invention the interior of the hollow rod 232 is placed in communication with the rearward end of the leed cylinder by means of the port 4U in order that motive fluid ,admitted to the rearward end ol the feed cylinder may be conducted to the intake 16 of the valve 14.

0n the rearward end of the feed c linder is shown the valve casing 41, in W ich is mounted the turning plug 42 and to which is connected the air hose 43. The valve is provided with the operating handle 44 and the air admitted through the hose is conducted through a longitu inal passage 45 of the valve and communicating radial passages 46 and 47 for supplying air to the rearward end of the feed cylinder and through a traue'- versely removed communicating radial passage 48 for supplying air to the forward end of the feed cylinder.

ln the saine plane as the passages 46 and 47 the valve casing is shown with oppositely located passages 49 and 50 respectively placing the interior of the casing in communication with the rear end of the cylinder and the atmosphere and in the same plane the valve is provided with the exterior arenal passage 55. When the valve is turned to place either the passage 46 or 47 in communication with the passage 49 the rear end of the cylinder will be supplied with motive luid and when turned to place the passage in communication with both passages 49 and 50 the rear end of the cylinder will be exhausted.

In the same plane as the passage 48 the valve casing is shown with passages 5l and 53, the passage 51 placing the interior of the casing in commumcation with a passage 52 formed through one of the ways 28 and opening into the forward end of the cylinder and the passage 53 placing it in communication with the atmosphere. In the .same plane the valve has the exterior arcuate groove 54. When the valve is turned to place the passages 48 and 51 in communication motive fluid is admitted to the forward end of the cylinder and when turned to Dlace the passage 54 in communication with both passages 51 and 53 the forward end of the cylinder is exhausted.

The operation of the valve 42 will be best understood from Figs. 8, t). 10 and 11, in which the sections a-a and b-b correspond to those taken in the lines a--a and r-Z) of Fig. 5. Fi 8 represents the neutral position. It will be noted in this position the passa e 49'leading to the rear end of the cylin er and the assage 51 for supplying air to the forward end of the cylinder are blanked. If the Valv'e is turned clockwise from the (positiondndicated by Fi 8 to that illustrate by Figs. 9, air is sup ied to the rear end of the :feed cylinder t rough the passages 4:6 and 49 and thence through the hollow rod 32 to the tool actuator and the air from the forward end of the cylinder is exhausted to the atmosphere through the passages 52, 51, 54 and 53. Under the conditions illustrated by Fig. 9, the tool is fed towards 'the work and by manipulation ol' the valve carried by the acuator, percussion may be imparted to the steel or the hole blbwn at will.

If the valve is turned from the neutral position illustrated by Fig. 8 counterclockwise Vto that illustrated by Fig. 10, the rear end of the cylinder is su plied with air through the valve passage 4 while the forward end of the cylinder is supplied with air throu h the valve passage 48. Under these con itions as the forward side of the feed piston head is of greater effective arca than the rearward side, the drill steel will be retracted. If it is desired to retract thc drill steel without suppl ing air to the hammer or if it is desire to increase the retractive effort, the valve may be moved counter-clockwise from the position illustrated by Fig. 10 to that illustrated by Fig. 11. Under the conditions illustrated by Fig. 11 the forward end of the feed cylinder is supplied' with motive fluid through the valve passa 48 and the rearward end of the cylinder 1s exhausted by reason of the valve passage 55 establishing communication between the assages 49 and 50.

It will be note that the hammer can be controlled if desired by the valve carried by the feed cylinder, for exam le, if the machine is bein fed forward wit the actuator valve positioned for either actuation of the hammer or for blowing the hole, movement of the feel valve to its neutral position will `secure the same result as far as the actuator is concerned as if the actuator valve were closed and further when the valve 42 is in the positions illustrated by Figs. 9 and 10 the supply to the actuator may be throttled without atl'ecting the feed. As illustrated by Figs. 1 and 7, it will be noted that the tool may be actuated by applying thereto both percussion and rotation or rotation alone and contemporaneously with the latter the hole may be blown. It is of advantage when the drill steel binds in the hole to actuate the same and blow the hole to loosen it and at the same time apply a retractive force. The feed valve provides that after the actuator valve has been sct to blow the hole and rotate the bit, during the retraction of the machine, the rotation and hole blowin may be continued or interrupted at wil without affecting the retraction by moving the feed valve respectively to the positions illustrated by Figs. 10 and 11.

For attaching the machine to a suitable support, for example, a tripod or a mine column I provide the attachment 56 having a sup ort engaging member 57 and the clips 58 which are adapted to slide along the ways 28 and be clamped to said ways and support engaging portion by means of the bolts 59,

It will bc noted that the tool actuator may and feed piston, are used onlyT in their rela` tive sense to facilitate describing the cmbodiment of the invention shown in the drawings, and that these words as used iu the claims are to be considered in the saule sense, and not as limitations to any particular iosition or mode of manipulation of the mac line.

Although I have described one specific embodiment of my invention for purposes of illustration, it is to be understood that withing the scope of the invention wide devia tions from this embodiment can be made without departing from the spirit of the invention.

Claims:

1. In a drilling machine, a hammer drill for actuating a drilling tool, a stationary feed cylinder carrying means for detachably connecting it to a support at a point intermediate its length, said,v hammer drill being detachablv carried by a cradle sliding on said cylinder, a feed pistonin said cylinder, a substantially U-shaped connection between said piston and said hammer drill,

one arm of sa1d U-shaped connection entering the rearward end of said cylinder and the end of the other arm thereof being connected to the rearward end portion of said hammer drill, said arms bein of such length as to permit said hammer rill to traverse the entire lenoth of said cylinder.

2. In a dri ling machine, a feed cylinder carl-yin on its upper and lower sides oppositely isposed pairs of ways extending;r lengthwise thereof, means slidably carried by the pair of ways at the lower side of said cylinder for attaching said cylinder intermediate its length to a support, a cradle slidably carried by the pair of ways at the upper side of said cylinder, a hammer drill detachably carried by said cradle, a piston in said cylinder, a tubular piston rod extending from the rearward end of said cylinder and having a return bend connected to the rearward portion of said hammer drill, said piston rod bein in fluid communication with said cylin er and hammer drill for conducting motive Huid, and con- I trollin means for said motive fluid for indepen ently varying the drilling speed and feeding force.

3. In a drilling machine, a fluid pressure operated hammer drill formed for carrying a drill steel, a fluid operated feedinor device comprising a feed cylinder, said cylinder carrying oppositely disposed ways arranged lengthwise thereof, one of said ways carrying means for connecting said cylinder' intermediate its length to a support, a cradle slidably mounted in the other of said ways, means for securing said hammer drill to said cradle, a piston in said feed cylinder, a piston rod extending through the rearward end of said cylinder, said rod comprising a tube having a return bend connected to the rearward portion of said hammer drill, the interior of said rod being in fluid communication with said cylinder, and means comprising the interior of said rod for varyin the motive fluid su p1 to said feed cylin er and hammer drill or varying the drilling speed and feeding force.

4. In a drillm machine having provision for carrying a ollow drill steel, feeding means for said steel comprising a. feed cylindercontaining a feed piston, `an o erative mechanical connection between sai piston and said steel, said piston and cylinder formed to provide differential working pressure surfaces so dis osed that when motive fluid acts upon the arger surface said steel will be retracted relative to the work, conduit means providing a fluid connection between tlie bore `of said steel and said cylinder at the side of said piston havin the smaller of the differential pressure sur aces, means for supplyin motive iiid to said cylinder for action on y on the larger of said surfaces whereby the drill steel may be retracted without blowing the drill hole, and means for supplying motive fluid to said cylinder at both sides of said piston whereby said steel may be retracted while the drill hole is blown.

5. In a drilling machine having provision for carrying a hollow drill steel, a fluid 0perated drill steel actuator, feeding means for said steel comprising a feed cylinder containing a feed piston, an operative mechanical connection between said piston and said steel, said piston and cylinder formed to provide differential working pressure surfaces so disposed that when motive fluid acts upon the larer surface said steel will be retracted relative to the work, conduit mcans providing a fluid connection between both the bore of said steel and the intake of said actuator and said cylinder at the side of said piston having the smaller of the differential pressure surfaces, means for supplying motive fluid to said linder for action onl on the lar r of said surfaces whereby t e drill stee may be retracted maaien without blowing the drill hole or operation of said actuator, and means for supplying motive fluid to said cylinder at both sides of said piston whereb said steel may be retracted while the drill `hole is blown and the actuator is in operation.

6. In a drilling machine, fluid actuated feeding means comprising a feed cylinder, a drill actuator mounted to slide u on and supported by said feed cylinder, a eed piston in said cylinder, and a rearwardly extending piston rod formed of a tube having a reverse bend connected to said actuator at its rearward end portion.

7. In a drilling machine, fluid actuated feeding means comprising a feed cylinder, a fluid operated drill actuator mounted to slide upon and supported by said feed cylinder, a feed piston in said cylinder, a rearwardly extending hollow piston rod having a reverse bend connected to said actuator at its rearward end ortion, and means for conducting the motive fluid for one of said llud operated instrumentalities through said ro 8. In a drilling machine, fluid actuated feeding means comprising a feed cylinder, a. drill actuator mounted to slide u on and supported by said feed c linder, a eed piston in said cylinder, a ollow feed piston rod having a reverse bend, a valve block carried by said actuator at its rearward end portion, and a mechanical and fluid connection between said rod and said block.

9. In a drilling machine, fluid actuated feeding means comprising a feed cylinder, a drill actuator mounted'to slide u on and supported by said feed cylinder, a eed piston in said cylinder, and a rearwardly located U-shaped structure operatively connected at opposite portions to said piston and actuator, said structure permittin said actuator to extend beyond the end o said cylinder at each end of its feeding stroke.

10. In a drilling machine, a feed cylinder having longitudinally disposed ways tioned on opposite sides thereof and integrallv carried thereby, a support attachment slidably connected to one of said ways, a. drill actuator slidably connected to the other of said ways, a feed iston having a piston rod extending througli the rearward end of said cylinder, and an operative connection between said iston rod and the rearward end portion o said actuator.

1l. In a drilling machine, a cylinder, wavs carried by said cylinder, a cradle slidab y supported on said ways, a drill actuator carried by said cradle, a feed piston having a piston rod extending through the rearward end of said cylinder, and an operative connection between said piston rod and the rearward end ortion of said actuator.

12. In' a dri ling machine having proviposiator comprising a casin rhaving a separable member at its rearwar end, a cradle with means for detachably connecting it to said casing, a feed cylinder having longitudinal ly disposed ways for slidably supporting said cradle and having a feed piston and a rearwardly projecting piston rod, said separable member having means for attachment to said rod, whereby said actuator may be readily detached from said cradle and a handle carryin member substituted for said separable mem er toconvert said actuator into a hand tool.

13. In a drilling machine having provision for carrying a drilling tool, a tool actuator comprising a sectional casing, a feed cylinder, a feed piston, means for attaching said piston to one of the sections of said casing, a cradle slidably supported by said cylinder, and common means securing sections of said casing and cradle in assembled relation.

14. A rock drilling machine having, in combination, a drill steel actuator having provision for carrying a forwardly projecting drill steel, feedingl means for moving said actuator relative to the work, said feeding means comprising a cylinder and piston, said cylinder slidingly supporting said actuator, and a connection between said actuator and piston, said connection comprising a substantially U-shaped structure situated at the rear of said cylinder and actuator and providing a rearwardly extending handle for moving said actuator.

15. A drilling machine having, in combination, a drill steel actuator, fluid feeding means for moving said actuator toward the work, said feeding means comprising a cylinder and piston, said cylinder slidingly supporting said actuator, a support for said feeding means, and an operative connection between said actuator and piston, said connection entering the rearward end of said cylinder and providing a handle at the rear of said cylinder and actuator for moving said actuator.

16. A drillingmachine having, in combination, a fluid operated drill actuator, a fluid operated telescopic feeding means therefor, said feeding means comprising a cylinder and piston, said cylinderl slidingly supporting said actuator, a tubular connection between said'actuatorl and piston providing a rearwardly extending handle for moving said actuator, and fluid conduit means for supplying one or the other of said fluid oierated instrumentalities by way of said tu ular connection.

17. In a rock drill, a feed cylinder having ways on opposite sides thereof below the top, a cradle sliding in said ways, a drill steel actuator having a sectional casing held in assembled relation by side bolts. said cradle having ears through which said side bolts pass, a feed piston in said cylinder, a rod having a return bend connecting the rearward side of' said piston to the rearward side of' said actuator, said rod having a fluid conduit leading from adjacent its point of connection with said actuator to said cylinder.

18. In a rock drill, a feed cylinder having ways on the sides theieof at its top and bottom, a support connection sliding on the ways at the bottom of said cylinder, a cradle sliding on the ways at the top of said cylinder, a drill steel actuator carried on said cradle, a feed piston in said feed cylinder, and a feed piston rod having a return bend connecting said actuator to the rearward side of said feed piston.

19. In a rock drill, a feed cylinder, ways carried by said feed cylinder, a drill steel actuator Slidingly mounted on said ways, a feed piston in said cylinder having a piston rod with a return bend connected to said actuator, a valve carried b said feed cylinder and a conduit in sai piston rod controlled by said valve for supplying said actuator.

20. In a fluid operated rock drill, a feed c Ylinder having a drill steel actuator slida ly mounted thereon, a feed piston, a rearwardly extending connection between said actuator and feed piston, and means for throttling the motive fluid supply to said actuator and for simultaneously controlling the fluid supplied to said cylinder for securing a slight feedin force, whereby the aplication of the dri steel to the work may e controlled manually by said rearwardly extending connection.

21. In a drilling machine, a hammer drill having a hammer piston and hollow drill steel, a cleansing fluid tube extending from the rearward end of said hammer drill through said hammer piston for conducting cleansm fluid for passage through said hollow drilsteel, a mounting for said tube permitting said tube to be withdrawn through the rearward end of said hammer drill, a feed cylinder and feed piston, said hammer drill being supported by and slidably mounted on said feed cylinder, a feed piston rod having a portion extending from the rearward end of said feed cylinder and a return portion connected to the rearward end ortion of said hammer drill, and said rtions being spaced to permit said tube to e withdrawn while the machine is assembled.

22. In a drilling machine, a hammer drill having a hammer piston and hollow drill steel, a cleansing fluid tube extending from the rearward end of said hammer drill through said hammer piston for conducting cleansing fluid for passage through said hollow drill steel, a mounting for said tube permitting said tube to be withdrawn through the rearward end of said hammer drill, a

feed cylinder and feed piston, means for connecting said feed cylinder to a sup ort and mounting said hammer drill for sli ing relatively to said feed cylinder, and a substantially U-shaped piston rod structure operatively connected to said feed piston and hammer drill at the rearward end of 'said machine, said piston rod structure permitting removal of said tube While said machine is assembled.

23. In a drilling machine, a drilling instrumentality including a hammer drill carrying at its forward end a hollow drill steel and havin an axially positioned cleansin fluid tu e removable through its rear en a feeding instrumentality including a feed cylinder on which said hammer drill is supported and slidably mounted with its axis substantially in a plane including the axis of said cylinder, a iston in said cylinder having a piston ro (positioned axially of said cylinder, said ro having a, lower portion extending from the rearward end of said iston and a connected upper portion spaceldJ from said lower portion and connected to the upper part of said end portion of said hammer drill, and said piston rod being hollow for conducting motive fluid for actuation of one of said instrumentalities and being in fluid communication with said cylinder.

24. In a drilling machine, a feeding motor comprising a stationary feed cylinder and a movable feed piston in said cylinder, a drilling motor comprising a hammer c linder, a substantially U-shaped piston rod isposed in a vertical plane and having its opposite end portions operatively connected respectively to said feed piston and hammer cylinder, said rod extending through the rear end of said feed cylinder and means independent of said rod for slidably connecting said feed cylinder to said hammer cylinder in sliding non-rotatable side by side relation.

25. In a drillin machine, a. feeding motor comprising a stationary feed cylinder and a movable feed piston in said cylinder, a drilling motor comprising a hammer cylinder, a ho low substantially U-shaped piston rod disposed in a vertical plane and having its opposite end portions operatively connected respectively to said feed piston and hammer v cylinder, said rod .extending through the rear end of said feed clinder, and means for conducting motive uid through said hollow rod for actuation of one of said motors, means independent of said rod slidably connecting said feed cylinder to said hammer cylinder in sliding non-rotatable side by side relation.

26. In a drillin machine, a feeding motor comprising a stationary feed c linder and a movable feed piston in said cylinder, a drillin motor comprising a hammer cylinder, a su stantially U-shaped piston rod disposed in a vertical plane including the axes of both said cylinders and having its opposite end portions operatively connected respectively to said feed piston and hammer cylinder, said rod extending through the rear end of said feed cylinder, and means independent of said rod for slidably 'connecting said feed cylinder to said hammer cylinder in sliding non-rotatable side by side relation.

:27. A drilling machine having, in combination, a fluid operated hammer rock drill, fluid operated feeding means for said drill comprising a feed cylinder member and a member providing a feed piston and feed pistou ro ,one of said members of said feeding means being stationary and the other movable, means independent of the movable member for slidably connecting said drill to the stationary member, a substantiall U-shaped structure connected to said dril for causing actuating Huid admitted to said cylinder to feed said drill, said U-shaped structure including said movable member and being positioned at the rear of Said machine.

28. A drilling machine having, in combination, a fluid operated hammer rock drill fluid operated feeding means for said drill comprising a feed cylinder member and a` member providing a feed piston and feed piston rod, one of said members of said feeding means bein stationary and the other movab e, means in ependent of the movable member for slidably connecting said drill to the stationary member, and means at the rearof saidmachine including said movable member for connecting said piston to said drill, said means comprising a part laterally offset from said movable memberand operatively connected to said drill.

29. A drilling machine having, in combination, a fluid operated hammer rock drill, fluid operated feedin means for said drill comprising a feed cy inder and means providing a feed piston and feed piston rod, said rod projecting from the rear end of said c linder, means independent of said rod for s idably and non-rotatably connecting said drill to said feed cylinder, means including said rod for connecting said piston to said hammer drill, said means including a part o eratively connected to said rod and drill, t e forward end of said art being in laterally offset relation to sai rod to permit said end to move over the side of said cylinder.

30. A drilling machine having, in combination, a fluid operated hammer rock drill, fluid operated feedin means for said drill comprisin a feed cy inder and means providing a eed piston and feed piston rod said rod projecting from the rear end of said cylinder, means independent of said rod for slidably and non-rotatably connecting said drill to said feed cylinder, means including said rod for connecting said piston to said hammer drill, said means including a part operatively connected to said rod and drill, the forward end of said part being in laterally offset relation to said rod to permit said end to move over the side of said cylinder, and means including a fluid conducting conduit in said rod for supplying motive fluid to one of said fluid operated instrumentalities.

31. A drilling machine having, in combination, a fluid operated hammer rock drill, fluid operated feeding means for said drill comprising a feed cylinder and means providing a feed piston and feed piston rod. said rod projecting from the rear end of said cylinder, means independent of said rod for slidably and non-rotatabl connecting said drill to said feed cylin er, means including said rod for connecting said piston to said hammer drill, said means including a part operatively connected to said rod and to said drill, the connection to said drill being at that side thereof which is opposite said cylinder, an axially positioned cleansing fluid tube in said drill removable through the rear end thereof, said part being so formed and disposed as to permit removal of said tube while said part is connected to Said drill.

In testimony whereof, I have signed my name to this specification.

GEORGE H. GILMAN.

cluding said rod for connecting said piston to said hammer drill, said means including a part operatively connected to said rod and drill, the forward end of said part being in l laterally offset relation to said rod to permit 5 viding a feed piston and feed piston rod.

Said rod projecting from the rear end of said cylinder, means independent of said rod for slidably and non-rotatably connecting said drill to said feed cylinder, means includingr said rod for connecting said piston to said hammer drill, said means includin} r a part operatively connected to said rod and to said drill. the connection to Said drill being at that, side thereof which is opposite said cylinder. an axially positioned cleansing fluid tube in said drill removable through the rear end thereof, said part being so formed and disposed as to permit removal of said tuhe while said part is connected to said drill.

In testimony whereof, I have signed my name to this specification.

GEORGE H. GILMAN.

CERTIFICATE OF CORRECTION.

Patent No. l, 659, 138.

Granted February 14, 1928, to

GEORGE H. GILMAN.

[t is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 6, line 54, claim 25, after the word "cylinder" insert thc words "means independent of said rod for slidably connecting ..iid feed cylinder to said hammer cylinder in sliding non-rotatable side by side relation," and lines 56 to 60, same claim, strike out the comma and words means independent of said rod slidably connecting said feed cylinder to said hammer cylinder in sliding non-rotatable side by side relation"; and that the said Letters Patent should he read with these corrections therein that the same may conform to the record of the case in the Patent Office.

signed and sealed uns 3rd' day of April. A. n. 192s.

Seal.

M. J. Moore, Acting Commissioner of Patents.

CERTIFICATE OF CORRECTION.

Patent No. 1,659,138. Granted February 14, i928, t0

GEORGE H. GILMAN.

lt is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 6, line 54, claim 25, after the word "cylinder" insert thc words. "means independent of said rod for slidabiy connecting auid feed cylinder to said hammer cylinder in sliding non-rotatable side by side relation," and lines 56 to 60, same claim, strike out the comma and words means independent of said rod slidably connecting said feed cylinder to said hammer cylinder in sliding non-rotatable side by side relation"; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 3rd day of April, A. D. i928.

M. J. Moore, Seal. Acting Commissioner of Patents. 

